摘要
１３年生火炬松１８个种源间木材基本密度存在着显著的差异，其广义遗传力大于０．４２，并随着树龄的增大而有加强的趋势。方差分析中种源、环境方差分量各占１／２，反映出遗传、环境对火炬松基本密度有着重要的影响。株内径向基本密度以递增模式为主，林木不同生长阶段基本密度间存在着显著的正相关，反映出早期测定是可行的。基本密度与种源原产地经度、纬度间相关系数很小，无明显的经向或纬向变异模式。种源内个体间基本密度的变异大于种源间的变异，基本密度与树高、胸径、材积存在着正相关。火炬松在种源选择的基础上进行个体选择可获得生长量、材质的双向增益。综合评估表明Ｌ１、Ｌ３、Ｌ１４和Ｌ１６为工业用材优良种源。
The significant difference in basic
density was found among 18 provenances of 13yearold exotic loblolly pine in Wuhan. Its broad
sense heritability was more than 0.42 and increased with tree age. According to the variance
analyses, factors of the provenance and environment accounted evenly for 50%, which reflected
that genetic and culturing site had a important effect on basic density. In radial direction, basic
density increased from pith to bark. The earlylate corrlation coefficient of wood basic density
were examined to be significant at 0.001 level. This showed it was practical to predict basic
density of old trees at early stage. Basic density was not clearly correlated with latitude and
longitude of the local provenances and it was positively related to height, diameter at breast
height and volume of trees. The difference in basic density among individuls within a given
provenanc was greater than that among provenances. These meant that tree increments and
wood basic density may be improved
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1999年第2期180-184,共5页
Journal of Huazhong Agricultural University
基金
湖北省科委资助
国际科学基金
关键词
火炬松
引种
基本密度
遗传变异
种源
loblolly pine, provenance, basic density,
genetic variation, comprehensive selectionwhen the individual tree selection was done within
some beter provenances evaluated.\
